I Have A 1cm Hard Lump Above My Eyebrow. Feels

I have a 1cm hard lump above my eyebrow. Feels like bone, it's not moveable. It's most noticeable if you stretch the skin. It's not painful or tender, but I have been getting quite a few headaches. Went to my GP and mentioned osteoma but she said it was unlikely and was more probably a cyst. But from what I read it's not like a cyst. Should I go back to my gp to ask for a scan? Is there any chance my skull could just be like that and I haven't noticed before? One thing to mention, I hit my head quite hard a few years back and since felt like one eye has bulged more. Is there any chance this could all be connected?

Thanks,
Dominique